Behold a Pale Horse is a 1991 book by William Milton Cooper.
Written after Cooper had been a member of the US Naval Intelligence Briefing Team of the Commander in Chief of the United States Pacific Fleet, the book details many of Cooper's claims about the alleged influence of UFOs on US government agencies, the New World Order, the assassination of President John F. Kennedy, the alleged Apollo hoaxes and other topics.
Another claim made in the book pertains to his own death. William Cooper, seemingly paranoid, claimed that he would be shot to death on his own property. True to his "fate," he was gunned down in precisely this manner years after publishing the book and settling down in Arizona.
The title of the book alludes to a passage in the Bible, Revelation 6:8: "And I looked, and behold a pale horse: and his name that sat on him was Death, and Hell followed with him."

Behold a Pale Horse is definitely not a book to curl up on the couch with on a Sunday afternoon. The topics William Cooper discusses will very likely keep you reading late into the night. There are two types of people in the world: those who want to know who exactly is controlling whom, and those who are more comfortable taking things at face value. What really disturbed me was the theory of the true intent of the government. Cooper's account of what the government is capable of in times of heightened alert is extremely relevant now. It is important to keep in mind that this book was published before the attack on the World Trade Center because the US is finding itself in exactly the position Cooper predicted. Whether or not you think you might agree with the information in this book, I recommend any book written by someone who was killed for the purpose of silencing him or her. Be an informed citizen and know what your government is capable of.